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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a506c2bd21a2022286a9e1777857ee1359f4a4efb66647949d1333f18914346c' 
  AND token = 'iozlMBEJuXuJLJzC7i+nUjmXyz2eOD7iPQji3/mHQ9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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