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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be97f5c7ef20ad291b9e795dc8241f32df20c40b91a543c6f31f6d32eded345e' 
  AND token = 'GjYQkIZR30dfDOr9BwG6fDr3aPp+WOGWYJBuiZHh4l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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