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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634e41b1be9a7b346602eb20162264ffa1690b6a47b1dc90ee491d04f8d42d25' 
  AND token = 'gNf7vR7eq6mmd2DU7EiX0if+reiuGshvKfttjTAOQ18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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