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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c1dc27329eeb96bcdbb1f710be2ad5aa6f1e302cf53ca162572ff3797d735f' 
  AND token = 'szXP2u6KgMJHG5gjf9RRT1Ke3LFi9A52OEuj8lgDnNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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