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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ca98f12ea040e6cdf0f39c0e488cf911219734aa7f124d43d0d3a428f64608' 
  AND token = '/TrpFULpMqxXDF4dIpGhQymFDmQJmcuXE26O05wP57c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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