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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5f26487e325a33b2db7512667431f2b081390b6ae8319ab6a3959f255c386c' 
  AND token = 'lkDXd2Jq4o8n+yzoA+UPN98Y97BgmNl4ikQipSHxJnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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