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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c00e0f9fa0dc1f4e47b7cb9ba458062195933c9369d3ea94a1e57d7b4ab875' 
  AND token = 'N6EcdYhzyyjY9TZ7HZO4qhkaUaTfSKZdzZ6jPZw70U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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