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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56287cabc4979eca4e680beaa3b06e452e0303c4939b62d367a5d310ca230af7' 
  AND token = 'PoHbS5wMXuhD2hqWr5s2NKAP1+sa2SHizvcDhGipg1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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