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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0e464b5c18c09d0d00b72f77d50f8619bfd7ef7e3b7bf14a136dbf2daf1f2f' 
  AND token = 'fq7xnaauxp0N/Ju+7YqFxghNtyJp28HMTs9jud3qBuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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