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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194009ee733219b63960bccbaf4855d609f4d7e657e3a8f4867bc94e8631ef0e' 
  AND token = 'tHqde3LDpE5bvjjxNmsAYbx3kr0EmdjG5lyMTlNPamA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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