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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ce379346c26d33b9efaf9815520e0e254a8645e4168608d3bb81a6fb8face0' 
  AND token = '51UhxZ4Fssovvu2+Z8vUbcaYi5Viwyuzyty8DwQ2NQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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