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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71027822b6d7252a2b42d0364cc0f77c003751c2a4b97b5912d12c4490e877a4' 
  AND token = 'njbUM6iMfYaEmlgJuWmZabDXcRzBT7ImChdUHnfDNPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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