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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460d8dcc6d39c7fa46bd717a8d31beafe02887b32a73aa0da3e8cdf9d93b52f2' 
  AND token = 'xL+z5wjriofo8YZWudKEOLFTBoW3LoNpR55m1OnjgIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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