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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2436172149d173a80815cfa3cb52c044be7b4fc3a988ce6686a25973eec0c5a3' 
  AND token = 'mzJ8+PGerH90RiozYZfV5gDc+oDIL3/TkpcaaOFB5R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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