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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac3e3a9e3b58b380333611ef429095b2ce406f17020771e6065fdf45cea9e10' 
  AND token = 'Sc9B0ATMPBKmxi7U3zF4Khds5Ti2AIaeLzo7AKiYUmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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