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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee9ddbddb9498f418ec91db386129d7792cc8a7a38f118ae91778e4946082f3' 
  AND token = 'K+hHHk72JGatNDnBnnD9LT/0eINjwYxtmM2nad+969Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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