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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c387d81d4c72c329854248b6d1375926e840e6f73d11aae02ccc95d4097d3c86' 
  AND token = '26+770G87Drz7nXkws3r6O3DlAguaSpn6cVQGOuRp9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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