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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491d608556ea4104defbe88c0e3ef6e19a1d7821a980ac7cc85ef8e9a1b26a5d' 
  AND token = 'SANrCrN9Z/QXIcjm6Io85IEiDxpNK4yhn7jxnPBDfao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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