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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba00d0bf5557d5c1be3e9f4e1efc92d7fa46249c8b70bc724741d91deb64dc86' 
  AND token = 'OfK9s9mVHarf4QZ2p8YndFBUKBz06wYnfaXlwP9uwOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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