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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f31339d174fe21627346ae2e6c92d44823e10499ff9d8a3dbe7872a98139c13' 
  AND token = 'GSEpfnahz7lGQEaVXHs1irThL4UYDpaKPKta85jlbdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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