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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce9839bcd0b8dbc5da5672c5d3d592c34565fe26c2e9cf9bcc922ea341bc8dc' 
  AND token = 'M+QXtsEmpXL+XLSbUxoz1JCxQkRnI96bgQ7Gvqs4/cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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