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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d1fac9f1c3ebf4eaf8ffe6a86d71438f3382317f41ebc319444b62bdcfdcdf' 
  AND token = 'JSRCC+BIjxr1PdogKyivM3r3uGVhVyQKjP23YZT68Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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