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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf9ead4f1da65cb280e80d196a0d58dff4c035c5e7320531013b6441d7d1920' 
  AND token = 'N1lQAaePJ+Z1b89gbtMmHdN4MKKQYhr/0NRAaBpmRf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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