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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cf50aa860a1430c2ba16e22959321b73a896ff363904e36b24550bd52b7e73' 
  AND token = '4WifJZoOTDql5xqt4S9R3+Qg+NHr7rXJefsUHxNKlEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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