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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31da63edb399df2c67aa627a23d3075ac0e8f0d2e9a128b6c245b6d23714e97' 
  AND token = 'ZEirZZDcy0mXhu26tHDIcAnShfL8BlrPJivLxRAVal0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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