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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7090024bbfd7085d99726fa4fcf63e698f0691d90a95ff194ca9249b8a89fa' 
  AND token = 'DdSp7ZNWLFSHkIJg5GOSW8N/86BJ6n4PWMBQ05PDjXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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