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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f1aab6aab8b8ab462b881ae4a7adecb32c77283fbd641ae56dc8de5d0f24af' 
  AND token = 'kiFl6J0kThh/ESO2gsTAcWq1igc0OScWWT08U0AnmIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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