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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d137ae260b52fc626080775667f6f4b4ff2c7a46c1cfedce6f1e86c8f28636' 
  AND token = 'hjvjkXI+WudEwT1fdxk5S625N1Q0zlkJZv2eagQmuKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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