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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ae18f3d437e70b34066785350b082b7de37ff819808b8e7d1a97efd338282f' 
  AND token = 'iSzQZrt2TeYWdhRgXvJQKfVZJyjQbOtUcYPLsTbrXTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00175

JSON explain

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