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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b5dc0b27decb11a8826e220392bb4e8a9b7a8d60c5997926e7d49a352c4dc7' 
  AND token = 'jQYBHzpQdtCxW6exJS8hd5kMG91P4EFjtbvHVJJaMyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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