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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ba638290fa0bb7d181f611e67576639900298d129125d50951a247e97ce73e' 
  AND token = 't2k+AseL0HbyqDSoLtIPeL8BaC8tLZP1CCes51cHPsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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