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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421f2feed16de1baeb0ea211e3f768cc78b987ad3e3b5865257f8881b017bf2c' 
  AND token = '0uKyb/wMnkNu/uFiDbiOWZdgziMHsDyP4A3OzoJ9eVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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