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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7e44635bf9a0eb1e9c57f7457d9133deaadccd6b49be896a8696b33b23e10e' 
  AND token = 'oDHAQaO13lcYgRvSvIWu1ad7rD104T4WyqkCqph3NEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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