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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba079f0982d94494c5eb0d204f9d4b881a953fe0b7401f359a113925c6319a2a' 
  AND token = 'XkuJz3ld63qQwjYCgi3kN67NQ6DqRK6xw+dBdlLqtis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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