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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f4931203e7ae311558b3e36527ef07781a9ca9bced8630177ad2aa1e75f5a6' 
  AND token = 'QL8oqOlJyQrWoxsHXiD9awKkfAIxerwUEzPW6zdJK80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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