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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbf4d4d5ce5e7c57e2654660dfeff640d2f87c2e1d6e0a4cd95df8613d270bb' 
  AND token = 'ami/BCPjPbQ3bsJ9A0YuA6U5TpiVX4FilMCPkK8WGdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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