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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd8c8129e6ea02cbee0ffa2d6cfec0346cc0264e96e8af0903f5a5a2ee1228f' 
  AND token = 'W2u0lQJBjdKbMsjIrOpxTjm7eaYxTo4Vl3oLBFmbfEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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