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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8b1534ae579748237b37213b0187d2352cc1403047b22896520a3f32e77e2f' 
  AND token = 'n61QSUPdCffDmfEVWf5McVivrRLME8DfdRXruieeS6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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