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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a7809374c8594252860776dc3bde47f04f40cfa5b93d460a12fda5c5f9fcf9' 
  AND token = '9d/TEAP0QAcy72uCy6ohbcndQ2acN980DFNMec/LnWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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