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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51624d4bb82fabecf6ecf46b6d8871b8355fccc5a6eb3f09e04d9b3cc0f67558' 
  AND token = 'vF0J1XPn9/T4WteX1n0pTtuWpbiGU/tr/1ajagdRnUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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