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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1f5e72a4058b00aa165fed3cf8e460e8cf84ed651eeedac490cea4e942e76a' 
  AND token = 'EkROkKl9oDXyqzmMjZF7a2epvEtMusRu2XerV2U2QvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00589

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}