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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b2645955ef4213e36c397a102128be6dc3ddeacc40226e6c2a723349e3464a' 
  AND token = 'zlYuoh8uLLf6ce5KFeiwb8WUiX92CadeY8irfh/IkfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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