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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b541a02629bf3821f5e6f95593633ceb4dec93b161f90605527ce9b3bf4e47' 
  AND token = 'MfHJT+1xVoVSSFdpcewtMrzf0Ea2tprklszoTVYAeVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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