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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41abd1ddcabad8c94a4846fbdb06e617da82f6688a1c33e0fca59d78a0e13e53' 
  AND token = 'n0HQ/qMRhCYQpuuzCkp6d6E5vCut/s5Nif07HKBa2os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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