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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74a1a15b57f9de7ef4caf2f6b02c0302b91bc57196b6c5fb5080361047916db' 
  AND token = 'rMegZ0KDfvjT03PWuBlKzK61EiS47IEn9wmRf9v1bIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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