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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2737ddfc5467d57060ade1e2dc4cc4b084798b4e351a75bf5ef68f4395ea810f' 
  AND token = 'tCd6aoBUBugv2AOGN9UniK/a4pxJetbn6AW7gBVzkKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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