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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad0046bfcc8c04e3145b68be258c0a577a6bc477fc681515abe487162f14b3b' 
  AND token = 'Afo/4tSA+0sdusPGr4a9F9AyHAVN6BwNFc+h/4N2Y2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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