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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90b06a4df31bc9ebb3983dbe6a8489d9ced77a59ebfe15135ff3824ed53d6e8' 
  AND token = '8vUnw7g0aU5krwOOs9XTDSh26E/tpH17cDuTFFFwczQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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