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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f3b82a6b16ef86fd0bac6d3d8c1f57cb028464efeecc5a88a88bb103e6c408' 
  AND token = 'BDmy/mPVeb0QmRcARW3d1m7E03YcMlDsBf7cNOsSC6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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