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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09296112dfef8f566768909c0d77ed73c33c916121750c31dc2d6c2edfc41b93' 
  AND token = 'ouYtTaiJnSyuuU5sJ9URQ52Ns/7Ym3zYfYaA5bOgoPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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