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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8d5c76574ec1db74c47a3124f0a7e0550361cae854f45ad9fc98be393e1e8c' 
  AND token = 'Ro0l8ciFjhHo4xRkikLQR483RGB5XXIFez9yR68Z7v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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