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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f132aedf678937e3124a7151a44e6358e4fe0850de2635847d9f3658f4ccee0c' 
  AND token = 'j9x1Mup57KnFDHwu2NWKQRKsD+IxDNLj61ayQl4p7I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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