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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e233f6aec1043a8bb37e5ebf808e03d9d90be963a9219949b31cf46afca1bfc' 
  AND token = 'GP7OyLcNdVFUlcd+BPtIT0Z10+8WX/gmIPnbUuuj+Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00471

JSON explain

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