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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c693573b52eb857132d3742e4d3cd7590a5aad9022211da72037dbc3c94b18c' 
  AND token = '6T17PXLdfKu5NtxpUUS2ksatIBCzrFU1oqGESipjZDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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