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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c462897ae7dbaf9c878aabb6d3ad6662b4b10f1fce09cec81d464ec1d44e57ce' 
  AND token = 'mjXixKVnldvK5G05nrSFoeT8nYSsdUBUDgHgr2RIDL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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