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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942b9c08c76005401899023aa717c82d8bd20f44743ea091cb21ca23505badcc' 
  AND token = '/lXSxjFjNdXjYkANSAY4mAOF6uR2eoWV5eE458WO8S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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