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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86cbbf913cc2d2ef277c88530d7e680c18fd201eeb8594c6ca8c16bb594a29c' 
  AND token = 'zrDvtU58XJdiqZtZH/kQf99p+kUHyItzm/KLamvyI8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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