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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f311efefa1662bf2461f04ef9c73300f196b0ae4332f5eca0388a2db481cfa5e' 
  AND token = 'fjkxCZJ4ve3NBYToTF7exMmhNC988a3x9iJfGAtAPeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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