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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851ac483dc5b70deb6305698d0414a86c9eafe54c3b6deffea4e6ad5d02c6673' 
  AND token = 'IgIfjA1H+1OJLm1t3vmfjO3QAvxl/tWspwuuBJWNSus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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