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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0584cbf272480fe610bfc8ef8c69648c2380fee1bcf0ae6d35ecfaea86e1128' 
  AND token = 'JCUagV2CLi46IlzWCkuyu7HZPsPNjCv6LhHJIl/tSqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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