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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc8d9d919c2b58364ea8cf10d3a06367c315f617f64ccd4ad7ef16858c30ad5' 
  AND token = 'wSsjUaUdmf1a7co+QPhCgftweFFMesZjvkH2t4wyke4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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