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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7317fd2c1c8aaff5ff126e40d533d4daf41a65b06a5c0b73bcfb3305829da17e' 
  AND token = '17zyB3pxcIpn8dQbdQx/Jvvdn+pARSqwL2eqS/BS1Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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