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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbce0f52a3fb589dc76831873cb669f45177430a3dfb2bcd31a2fa182ffd9744' 
  AND token = '6mRxXo3GFKYAiY1oMmMFJJuuOsc8H3/T6+xLzIS8ySU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00169

JSON explain

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