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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86056eb15dc20b977b3e426271a88f77c8b460ad6608fd433d2b8cb5a39c6852' 
  AND token = '3fNKUetjNJrc5CKEsk1OMK6lvVFxBCo5+31ejfEYIbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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