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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970d3621b5520ad46dee751f8cadec24e5e8d213fe2a2d8c04f315e7df5d4d8e' 
  AND token = 'lXax4iwZtwmo2ETdevoa4TN2RbnPDOQ4rd3q5Fx0Xa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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