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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0313b29e7d5764d393ae271df93275054286b4a58733895ec84090bad0a2f8' 
  AND token = 'k99howpYNTprVoZBqGIicASSdx3skWKLd1HZ9qzYRuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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