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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc00ef7cd625ca7e87541c8ce5f6329d44a9a9120d501c9eafae476c46557be2' 
  AND token = 'Sip6FrBAa9lzCH0IKsYWrDO9Xc4Rmu900+A0A3PIHlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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