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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6118e6703f1c0a5db6ad2e1de45445026235b6d04cdfc72be315b16c0dd2335c' 
  AND token = 'qAp0y6pZkuqxg3z55uagD28yHdlmDQFR09NXnJBGxf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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