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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b99a2f870cf138b479f1a0e070b658d6173e8fa0a75ae14859a8d2ca1ba6492' 
  AND token = 'EwdHl8h04vkbJJb8yQQWnsKE4kAEmv7UOpoVboxPFl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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