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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9140792286aba42a102277fcced670a813dbb4f78d1b161bb60e6f0e2cac58' 
  AND token = '7+o0q65UPBiRkTnpd/+Omch77VOLuwdxJ3CykWnu4UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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