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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633243db7d4266c2f38d34cde3fff1e3f896f31d3d406a04cdeda94897c02fe0' 
  AND token = '/q/v/J7qKrcUWJeDdmYxwFL9r8GE5Ur79C/eRvg2stM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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